INF5 - Informatica classi quinte

PHP & SQL injection
http://php.net/manual/en/security.database.sql-injection.php
https://www.w3schools.com/sql/sql_injection.asp

Avoid Cross Site Scripting
https://en.wikipedia.org/wiki/Cross-site_scripting

HTML & JavaScript Injection
http://php.net/manual/en/function.htmlspecialchars.php